add api/system-info method

lib/RetailCrm/Client/AbstractLoader.php

@@ -171,4 +171,19 @@ abstract class AbstractLoader
             true
         );
     }
+
+    /**
+     * Getting the system version, public and technical urls
+     *
+     * @return \RetailCrm\Response\ApiResponse
+     */
+    public function systemInfo()
+    {
+        return $this->client->makeRequest(
+            $this->crmUrl . 'api/system-info',
+            "GET",
+            [],
+            true
+        );
+    }
 }

tests/RetailCrm/Tests/Methods/CommonMethodsTest.php

@@ -74,4 +74,22 @@ class CommonMethodsTest extends TestCase
         static::assertTrue($response->isSuccessful());
         static::assertGreaterThan(0, count($response['settings']));
     }
+
+    /**
+     * System info
+     *
+     * @group api_methods
+     *
+     * @return void
+     */
+    public function testSystemInfo()
+    {
+        $client = static::getApiClient();
+
+        $response = $client->request->systemInfo();
+
+        static::assertEquals(200, $response->getStatusCode());
+        static::assertTrue($response->isSuccessful());
+        static::assertNotEmpty($response['systemVersion']);
+    }
 }